Working Principle

Flux Compensated Magnetic Amplifier soft starters are step less reduced Voltage starters which ensure a constant low starting current with incremental voltage and torque to the motor to achieve smooth acceleration of the drive. The Soft Starter is connected in series with the motor either on the line side or neutral side and thus controls the starting current and starting torque As the motor speed increases the FCMA impedance decreases to achieve incremental voltage and torque for the motor while keeping the current constant. The voltage across the motor increases smoothly from starting to run value with motor speed. A built-in bypass contactor closes to ensure full voltage running of the motor. Bypass contactor operation can be time, Current or speed based.

Medium and high voltage FCMA Soft Starters are designed and manufactured and tested in line with relevant clauses of IEC/ IS standards. The applicable standards are IEC60071-2, IEC60060-1, IEC 62271-1, IEC60529, IEC 60076-6 clause 3.1.5, IEC 60289. Type Tests carried out at - CPRI, Bangalore / ERDA – Vadodara LABS.

Natural Side Soft Starters

Line Side Soft Starters

Salient Features

Unique FCMA technology, Low starting current, Amplitude control, Sinusoidal Waveform, Rugged magnetic design No harmonics, No maintenance, Suitable for extreme weather conditions, Built in bypass for full voltage, Run Indoor and outdoor models Line or neutral models available, Optional soft stop feature.


Customized starting on limited power source, smooth starting and acceleration. Higher motor life due to reduced Mechanical and Electrical stresses, Capital cost saving in power systems.

Neutral side connection

Low fault level on neutral side, highly economical, easy retrofitting on existing installations, Can be located near the motor.